使用 PHP 从特定的 div id 获取数据

what is the way to fetch data from A Specific div id Using PHP. What i want to do is to fetch data from a div id called <div id="content"> , so all the data from that div id will be fetched in a variable.
I can fetch all content with my script but cant filter it to fetch data from a Specific div tag.
Here is the script i am using to fetch any content:

function file_get_contents_curl($url)
{
$ch = curl_init();

curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);

$data = curl_exec($ch);
curl_close($ch);

return $data;
}
$html = file_get_contents_curl("http://www.example.com");
//parsing all content:
$doc = new DOMDocument();
@$doc->loadHTML($html);
echo "$html";

有什么想法吗?

$html = file_get_html("http://www.example.com");
$displaybody = $html->find('div[id=content]', 0)->plaintext;